[Bug] Pie chart label background display is abnormal due to lineHeight

### Version

6.1.0

### Link to Minimal Reproduction

https://echarts.apache.org/examples/zh/editor.html?c=pie-half-donut&code=bZBBq8IwDMfvforA49HLDhU33tjDg6jgXfQiO2RdnMXajq4qIn53u7FVD-sl6T-_JH9iaieNhjk8JwANWUlNBgefQ6e0zz1qyoDVkljUS4K0I-tBlvBfFkEX8qGqsCCVhX4vSE0bktXJZTBN-MABmBvZozJ3P76whOewAKBAca6suepyaZTxu9iPECIAryEp0eHguHMNN1RXb3jK4zQCjZfW_JbQihOsdeWtsE_3F_83SwK-kpaEG-eSlAdufUGpxrE4jQO20-2NF2Uzjs74Z-JelmR6tCfzLra_fPL6fwM&enc=deflate

### Steps to Reproduce

如果饼图的标签同时设置 { backgroundColor: 'any color' } 和 { overflow: 'break' } ，当标签的行高 lineHeight 太大时，标签背景的宽度会异常。

If the label of a pie chart is set with both { backgroundColor: 'any color' } and { overflow: 'break' } , when the lineHeight of the label is too large, the width of the label background will be abnormal.

### Current Behavior

the width of the label background is too wide

### Expected Behavior

the width of the label background needs to fit label

### Environment

```markdown
- OS: win10
- Browser: Edge 150.0.4078.99
```

### Any additional comments?

_No response_

Start with the linked minimal reproduction and inspect the pie chart label configuration using backgroundColor, overflow: 'break', and a large lineHeight. Trace how the label background dimensions are calculated, then verify that the background width fits the label at the reported settings and remains correct in the reproduction.

Written by the indexing model from the issue text.